Is it true that i should not attend any wake within 100 days of my parent's passing? What is the reason? Is it not good for the friend's family whose wake I want to attend or not good for me or not good for both parties? 

Or its OK to attend the wake as long as the other party is OK to do so? 

During my mum's wake recently, a friend whose grandma passed away within a month, attended my mum's wake as I said its OK to attend and am not particular about such

 

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Extract:

1. The Traditional Chinese Guidelines or Common Practises

1.1. The traditional Chinese custom upon a death in the family of a parent or grandparent: "The usual practice is to either have a wedding within 100 days of the death, or to wait until 1000 days later (ie about 3 years). "

Generally this is our Chinese tradition. 

Today is considered as modern times.

Thus most of the time, so long as both parties are okay with it, then should not be a problem or concern.

Thanks